Army enlistment bonus!!! When am I getting my next installment payment?

I've been in the service (Army Reserve) for 4 years My.Anniversary date is today and Im just wondering when I get my next installment payment. I already received half of my $7,000 bonus after basic training and then another 1/4 payment 2 years ago. Do I get my last installment this year or do I have to wait?? Please help. Im really confused!